All three alchemists wear leveled, enchanted robes; from level 1-7, it will be black mage robes. From level 8 and up, the enchantments will match your level, and will fortify either Destruction, Restoration, or Alteration. From level 10, there is also a 25% chance the robes will have a regenerate magicka enchantment. Lastly, all of them wear the same type of boots.

They all carry a sample of nirnroot, some random, rare ingredients, and a leveled dagger (up to glass quality at level 18).